**Question 1:**
What is the common difference in the following arithmetic series: $2.5,6.4,10.3,\mathrm{...}$?

**Question 2:**
Which of the following sequences is an arithmetic series?

**Question 3:**
What is the $25$th term in the following arithmetic series: $1,4,7,\mathrm{10...}$?

**Question 4:**
What is the $31$st term in the following arithmetic series: $45,42.5,\mathrm{40...}$?

**Question 5:**
What is the sum of the first $21$ terms in the following arithmetic series:
$\mathrm{3,5,7,9}$?

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